<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		html, body {
			margin: 0;
			padding: 0;
			height: 100%;
		}
		.layout:after {
			content: " ";
			clear: both;
			display: table;
		}
		.layout {
			width: 100%;
			float: left;
		}
		.main {
			margin-left: 75px;
			background-color: #97765E
		}
		.sidebar {
			width: 75px;
			height: 100%;
			float: left;
			margin-left: -100%;
			background-color: #B19B75;
		}
		.sidebar:hover {
			width: 100px;
		}
	</style>
</head>
<body>
	<div class="layout">
		<div class="main">main</div>
	</div>
	<div class="sidebar">sidebar</div>
</body>
</html>